Deno’s Garden

Carica papaya

Genus Carica

Two sources report 4 treatments between them. All are shown.

Protocol 1

DerivedN. C. Deno, 1998

Difficulty Moderate Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on March 16, 2023.

  1. Dry storage

    Duration: 1460 daysTemperature: 70°F 21°C

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

about 4 years from start to sowing. Then 21 days to germinate.

40% germination in 21 days.

Seed Germination Theory and Practice, 2nd Supplement — N. C. Deno, 1998 · 2nd Supplement, Carica p. 23Public domain
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Carica (Caricaceae). C. papaya seeds DS 4 y and 5 y germ. 70L(40% in 3rd w) and 70D(none) similar to seeds DS G-2 y so that there is no sign of dying as yet. None germ. in 70D showing that the light requirement was unchanged.
Seed Germination Theory and Practice, 2nd Supplement, 2nd Supplement, Carica p. 23. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 22, 2027 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Sow and cover

    Temperature: 70°F 21°C Light: light

No stated waiting before sowing. Then 14 days to germinate.

43% germination in 14 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Carica p. 113Public domain
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Carica (Caricaceae). C. papaya required WC (7 d) and either light or GA-3. Seeds germ.. 70L(43% in 2nd w), 70D GA-3(95% in 3rd w), and 70D(none), The photorequirement was surprising in view of the jet black color of the seeds. Part of the samples in 70D and 70L were treated with GA-3 after 4 w whereupon the remaining seeds germ. 90-100% in the 2nd wafter the GA-3 treatment. A prior 3m at 40 was nearly fatal as shown by 40-70L(10%), 40-70 GA-3(none), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Carica p. 113. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 3

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around September 17, 2027 for a May 3 last frost. Too late for spring 2027 — that needed starting on September 16, 2026.

  1. Clean the flesh off the seed

  2. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

  3. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C Light: light

about 6 months from start to sowing. Germination time not stated; 21 days assumed.

10% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Carica p. 113Public domain
Show the original text
Carica (Caricaceae). C. papaya required WC (7 d) and either light or GA-3. Seeds germ.. 70L(43% in 2nd w), 70D GA-3(95% in 3rd w), and 70D(none), The photorequirement was surprising in view of the jet black color of the seeds. Part of the samples in 70D and 70L were treated with GA-3 after 4 w whereupon the remaining seeds germ. 90-100% in the 2nd wafter the GA-3 treatment. A prior 3m at 40 was nearly fatal as shown by 40-70L(10%), 40-70 GA-3(none), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Carica p. 113. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 4

DerivedN. C. Deno, 1993

Difficulty Low Rated by us, not by the source.

Start around March 15, 2027 for a May 3 last frost.

  1. Clean the flesh off the seed

  2. Gibberellic acid soak

  3. Sow and cover

    Temperature: 70°F 21°C Light: dark

No stated waiting before sowing. Then 21 days to germinate.

95% germination in 21 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Carica p. 113Public domain
Show the original text
Carica (Caricaceae). C. papaya required WC (7 d) and either light or GA-3. Seeds germ.. 70L(43% in 2nd w), 70D GA-3(95% in 3rd w), and 70D(none), The photorequirement was surprising in view of the jet black color of the seeds. Part of the samples in 70D and 70L were treated with GA-3 after 4 w whereupon the remaining seeds germ. 90-100% in the 2nd wafter the GA-3 treatment. A prior 3m at 40 was nearly fatal as shown by 40-70L(10%), 40-70 GA-3(none), and 40-70D(none).
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Carica p. 113. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.